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<title> OpenGL&reg; 2.1, GLX, and GLU Reference Pages </title>
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<h1> OpenGL&reg; 2.1, GLX, and GLU Reference Pages </h1>

<p> Use the index at the left to choose any GL, GLU, or GLX reference page
    for viewing. These pages include all of the important usage information
    for each command. This information includes a description of all
    parameters, return values, error conditions, and related commands. </p>


<h2> Browser Compatibility </h2>

<p> Very old browsers, such as IE8, may not work with parts of this site.
    Please use modern browsers supporting HTML5 (e.g. IE9 and later). </p>

<p> Some of the reference pages depend on relatively complex math equations.
    We are using MathML, which is not supported on all browsers. The current
    <a href="../../gl4/"> OpenGL 4.5 refernce pages </a> use different
    techniques for math rendering, and should work on all modern browsers.


<h2> Downloading Man Page Sources </h2>

<p> The Docbook source for the reference pages is available from the <a
    href="https://github.com/KhronosGroup/OpenGL-Refpages"> OpenGL-Refpages
    </a> github repository. </p>


<h2> Feedback </h2>

<p> If you find any inaccuracies or typos in the reference pages, please
    file an issue (and, preferably, propose a pull request fixing the issue)
    in the <a href="https://github.com/KhronosGroup/OpenGL-Refpages">
    OpenGL-Refpages </a> github repository. </p>

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